IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready audit: type=1804 audit(1548817740.834:2666): pid=31240 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor0" name="/root/syzkaller-testdir413136028/syzkaller.GtKOZw/230/bus" dev="sda1" ino=16913 res=1 A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. ================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:43 [inline] BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:250 [inline] BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:941 [inline] BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x25e/0x5d0 net/rds/cong.c:229 Read of size 4 at addr ffff888085470104 by task syz-executor4/31242 CPU: 1 PID: 31242 Comm: syz-executor4 Not tainted 5.0.0-rc4+ #51 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:43 [inline] check_net include/net/net_namespace.h:250 [inline] rds_destroy_pending net/rds/rds.h:941 [inline] rds_cong_queue_updates+0x25e/0x5d0 net/rds/cong.c:229 rds_recv_rcvbuf_delta.part.0+0x34f/0x3f0 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:379 [inline] rds_recv_incoming+0x889/0x1430 net/rds/recv.c:379 rds_loop_xmit+0xf3/0x2a0 net/rds/loop.c:96 rds_send_xmit+0x1355/0x2a10 net/rds/send.c:355 rds_sendmsg+0x323c/0x44e0 net/rds/send.c:1368 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fed35b6ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458089 RDX: 000000000000c0fe RSI: 00000000204b3fff RDI: 0000000000000006 RBP: 000000000073bfa0 R08: 00000000202b4000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fed35b6f6d4 R13: 00000000004c56e4 R14: 00000000004d94a8 R15: 00000000ffffffff Allocated by task 30331: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 getname fs/namei.c:211 [inline] user_path_create fs/namei.c:3693 [inline] do_symlinkat+0xde/0x2c0 fs/namei.c:4146 __do_sys_symlink fs/namei.c:4172 [inline] __se_sys_symlink fs/namei.c:4170 [inline] __x64_sys_symlink+0x59/0x80 fs/namei.c:4170 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30331: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 filename_create+0x29d/0x5a0 fs/namei.c:3658 user_path_create fs/namei.c:3693 [inline] do_symlinkat+0xf3/0x2c0 fs/namei.c:4146 __do_sys_symlink fs/namei.c:4172 [inline] __se_sys_symlink fs/namei.c:4170 [inline] __x64_sys_symlink+0x59/0x80 fs/namei.c:4170 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888085470480 which belongs to the cache names_cache of size 4096 The buggy address is located 892 bytes to the left of 4096-byte region [ffff888085470480, ffff888085471480) The buggy address belongs to the page: page:ffffea0002151c00 count:1 mapcount:0 mapping:ffff88821bc45380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001654788 ffffea0002151c88 ffff88821bc45380 raw: 0000000000000000 ffff888085470480 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888085470000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888085470080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888085470100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888085470180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888085470200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================